on 2/23/02 23:25, [EMAIL PROTECTED] opined:
> Besides, these measurement are always to the plane of the film, NOT the front
> of the lens as some people assume and I don't think Pentax has ever issued a
> camera with a film plane mark to measure at in any case.
I've seen it written that Pentax suggests using the back edge of the top or
bottom plate, minus a fat 2mm, to define the film plane. With the back open,
you can make an exact measurement from the inner guide rails to the
baseplate edge. I just measured 3 LXs, 2 MXs and a Program-A and they all
measured 8/100ths of an inch (5/64ths)(2.15mm) with a "Calibrated in the USA
by Spievak" stainless steel 6" ruler at 20 degrees centigrade, the ruler's
standard. My technique was to lay another ss ruler's edge across the open
back of the cameras from the top plate's back edge to the bottom plate's
back edge (after removing any motor drives, as they tend to stick out a bit
more), then drop the other calibrated ruler onto the top and bottom film
plane rails (not the guide rails that keep the film centered) to get the
measurement.
I'd be more accurate, but my depth micrometers are both buried in storage 10
miles from here. :-)
JoMac, Pentaxian
"Pentax, Quadraphonic, Betamax, Macintosh"
and above the rest.
k t,
s e n
Living life a w o
almost parallel to, r
yet ever so slightly o u t -------> f
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